Hydraulic valve.



H. HAISS.

HYDRAULIC VALVE. I I APPLICATION FILED IUNE 86 1916- Lgagwm I Patented July 10,1917.

2 SHEETS-SHEET 1 H. muss. HYDRAULIC VALVE. APPLICATION FILED JUNE 8.1916.

Patented July 10, 1917.

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HUGO HAISS, 0F ALLIANCE, OHIO, ASSIGNOR TO THE MORGAN. ENGINEERING CblVIPANY, OF ALLIANCE, OHIO.

HYDRAULIC VALVE.

Specification of Letters Patent.

Patented July 10, 1917.

Application filed June 8, 1916. Serial No. 102,419.

To all whom it may concern:

Be it known that I, I-IUco I-IAIss, a subject of the Emperor of Germany, and a resident of Alliance, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Hydraulic Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in hydraulic valves, adapted particularly for use with presses for forging, punching, piercing, drawing, etc.

For the working manipulation of such hydraulic presses, accumulator water or water from high pressure pumping plant is usually used, and. it is the custom to regulate the supply and exhaust by means of three-way valves. For presses of large capacity, operated under high pressure water of 3,000 pounds per square inch or more, hand operated valves are difficult to operate, and slow in starting owing to the great power required to lift the valve from its seat. Another disadvantage of the three-way valve is that the exhaust water passage thereof, is of the same area as the inlet valve.

The object of this invention is to provide a valve which is actuated to open the port from the accumulator to the press cylinder, and from the press cylinder to the exhaust port by the pressure of the water from the accumulator, and it consists in the parts and combinations. of parts as will be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in elevation of a press showing my improvement applied thereto. Fig. 2 is a view in vertical longitudinal section of the valve. Fig. 3 is a view in section on the line AA of Fig. 2. Fig. 4 is a view in section on the line B-B of Fig. 2, and Fig. 5 is a view in section of a modified construction.

The press illustrated consists of a base 6; columns 7; sliding cross-head 8 guided by the columns; the press cylinder and top platen 9 secured to the upper ends of the columns; plunger 10 mounted in the cylinder and connected with the cross-head, and the pull-back'cylinder 11, the plungers 12 of which are secured at lower ends to the cross-head. The pull-back cylinders are secured to the opposite sides of the top platen 9, and are preferably connected with the main hydraulic pressure line 13, and under the constant pressure so that the tendency of the pull-back cylinders is to maintain the cross-head 8 in its uppermost position, and thus operate to lift the same as soon as the pressure in the cylinder 9 against the main plunger or ram 10 is withdrawn. I

In the form shown in the drawings my improved valve 14 is secured to the upper end of cylinder 9 and is in direct communication at its bottom with said cylinder.

This valve consists of a body 15 having two chambers or cylinders 1 1 and 1 1*; top cover 16; sliding piston 17 having a bored piston rod 18; the puppet valve 19 and spring 20. The valve body 15 and cover 16 are preferably made of gun iron or cast steel accurately bored and polished and provided with four ports. The upper port 21, leading from the cylinder 14* above the piston 17, is connected by pipe 21 to a threeway operating pilot valve 22, which has pipe connection 23 and 2 1 respectively with the hydraulic pressure line 13 and exhaust pipe 25. .The port 26 connects with the main hydraulic pressure line, adjacent the bottom of the cylinder 1 1 in which the piston 17 moves so as toodischarge water under said piston. Port 27 leads to the press cylinder 9, and port 28 connects with the exhaust pipe 25, the said ports 25 and 27 being in communication with chamber 14 The piston 17 and hollow piston rod 18 are preferably madc integral as shown, the piston being located in chamber or cylinder 14* and the piston rod extending from cylinder 14 to the chamber 1 1 and constituting the sole medium of communication between the two. This piston and its rod are accurately guided, and are packed by hydraulic U leather packings 29, in order to prevent leakage of the pressure water in either direction.

The piston 17 is hollow and is closed at its top by a bronze threaded nut 30, which acts as a guide for the valve 19 and a housing for the spring 20, a square section loose leather ring 31 being used as a packing to prevent the passage of any water under pressure up around the head 30. This piston is provided at the juncture of the latter with the piston rod 18, with a seriesof holes 32 for the'gpassage' of the ressure water, and is also provided with a series of holes 33 for, the legs 3e of the valve chair 35. This valvechair 35 carries the val-vs 19" and is provided with a tubular extension to receive the lower end of the Spring QQ; the upper end of said spring embracing the lug 36 integral with the to 30 of the piston.-

The valve 19 is of t e puppet valve type and rests on a conical seatat'the up er end of the'piston red, the latter, as shown being integral with the piston 1-7, with it's here ihcommunication with" the honhw piston.- The valve 1 9' is therefore within the piston and normally epe'rhtee to close the upper" end of thegh'ore of the ptstth red: 4

The piston red is pitched intermediate the cylinder 14 and ohalirhe'r 14$"; previously eX'p lained and its lower end is made tomcat to en age the cohial verve seat 3 7, at the upper end of pt5rtv217 leading to the presscylihd er. .Fiomthe foregoih it will be seen 7 that portal whithle'ads from thepilotval ve' opens'iii'to" the cylinder 1%? above the piston 17; port 26* from the accumul ator tommhhh cateswith' said cylinder below the piston, while port 27 retirin he the ress cylinder and exhaust p ort 28'; c'ohnnunihats with chaihber 14 and has no connection with the ylih-der 14 exeept' thtoagh the hate or the piston he. V

In theo eration of the valve, water from the aehumtilhtor or other source hf fluid ressure, is adrnittedthrough' pipe toipert 26', and f om the latter to the valye cylinder 14? below piston 17, and operates to force heath-91a the valve t9 down onto its that thus ateih'gthe bore through the pistorr the,-

so asto preterit any pressure water" from.

enteringtlie press cyliii'dfer, a1id elevates the episto'n 1? as shown in Fig, 2. This upward move ent of the iston-r7 and its rod 18,-

puts the port 2'? to the press cylinder int'o cemthuhithttoh with t e hemes 14 i and with exhaust port 28, so that any water in a, the riest cylinder white free to he forced 7 tion of the pull-beck cylinders.

out of the ress cylinder aha into said exh'a'lust port and pipe" 25' by thehehstaht a- YT O admitting water from the atethhnator .t thhgh the three-wa pilot verve to port 21 above the piston 17', the latter win he forced downward1y, -and will first hut-oh the exhaust port 28 from the presscylinder port 27, and then open vailye 19 b" reasoh or the Contact of the 1e s 34' of t e valve than; with the'sat es' hthh-gh whith prstoh rod is passes This movement or the valve 19 opens hhihmunidatioh Between the cylinder" is, and thepress cylinder, hy 116W ta- .7 mittin'g hrsshrewater into the (syn-thee 14 hr ugh pert 2h, it win pit-S's ehder' with rathreh h the here df the pisthh rh the into: the yh ttt t e h egete hi the that heather t6 force the cl'fos's heafd down:

port 27 a leading to the press cylinder is at theside; ahd exhaust port as is at the hott f51hioftheval vebody. iththis construeti'oir the rower" end P8 of the piston rod is closed, and the Patter is provided with side opeh-ihg's 1 8 communicatin with the bore of the piston rod for the passage of the water to the press cylinder when the piston rod is cl os'i ng the exhaust port.

This latter construction is designed for use on the side instead of at the top of the p- "ess cylinder, where the tot-ah height of the piess and velve would interfere with the work of overhtad cranes, and is also d'e-' signed for use on presses having horizontal press cyl-iiider's;

'Wher'r the press water is admitted and discharged thheugth a three-way valve; the exh'aust water port of the latter is of the" same area as the inlet valve or port. With my constructi'on the exhahst port may be consi 'erabl'y larger than the area of the inlet val-ye, so that the water will he discharged from the press cylinder much more rapidly than it is ad1nitted,-thus permitting of the quick return of the cross-head, which is imp'or'ta'ht for the rapid mani ulation of the press;

It is evident that niany slight chtthgeh might be resorted to in the rela'ti ve a'rrangeni'ht arts shown described without departing from tl'ie spirit and scope of my ifiyehti'on; Hence I would have it understood that 15 do not wish' to confine myself tothe e'xact construction herein shown and dsc'ribe'd, except as required by the scope Having fully described my invention what I- clain-i as flew and desire to secure by Letteis P atehtgis"? 1; A hydraulic valve for a press consisthag; or a eatih a piston and hollow piston rod in said c'a'silig, a valve for the end of the piston rod adjacent the} piston, means for positively' ope'r'iiirfg said piston rod valve when th piston rod is moved downwardly, a po ft leadi g to the vahze chamber" above the sistha for" the ahrhissi' h of water to move the piston downwardly, a port foi' presshrewater leading to the val'vei chamber bit-row the piston; a port adapted to co ninnicaat'e with a press cyllir'ider' and a discharge opencommunication with the Phit t0 the press oyhndei Wheii the iston and its rod are elevated, and which is out off from connection with said press cylinder when the piston rod is in depressed position.

2. A hydraulic valve for a press consisting of a casing, a piston and hollow piston rod in said casing, the said piston and its rod being suitably packed, a valve normally closing the opening at the upper end of the piston rod, means for opening said piston rod valve when the piston rod is depressed, a port leading to a press cylinder and in open communication with the bore of the piston rod, a discharge port closed by said piston rod when the latter is in its lowered position, a port leading to the piston chamber above the piston and a port for pressure water leading to the piston chamber below the piston, whereby when said piston is depressed the pressure water will pass through the piston rod to the press chamber port.

3. A hydraulic'valve for a press consisting of a casing, a piston and hollow piston rod, a valve for normally closing the open upper end of the latter, a spring for yield ingly holding said valve to its seat, means for positively opening the valve when the piston rod is depressed, ports communicating With said casing respectively above and be low the piston, and two ports communicating with said casing below the chamber or cylinder therein in which the piston moves, one of said latter ports communicating with the open bore of the piston rod, and the other adapted to be closed by the lower end of said piston rod when the latter is in its depressed position.

4. A hydraulic valve for a press consisting of a casing, a hollow piston and hollow piston rod, a valve for the upper open end of the piston rod, a spring for yieldingly holding said valve to its seat, a projection rigid with the valve and adapted to be engaged by a fixed stop for opening said valve when the piston rod is depressed, a port communicating with the piston chamber above the piston, a port communicating with the piston chamber below the piston, the piston having openings therein for the passage of water below same to the hollow piston rod, a port leading from the valve casing to a press cylinder, the said port being in open communication with the bore of the piston rod, and a discharge port in open communication with said press cylinder port when the piston rod is elevated.

5. A hydraulic valve for a press consisting of a casing, a hollow piston and hollow piston rod in said casing, the said piston and rod being suitably packed, the piston having openings therein for the passage of water to the upper end of the hollow rod, a valve for closing the upper end of the bore of the piston rod, a spring yieldingly holding said valve to its seat, a projection from the valve adapted to engage a fixed stop for opening said valve when the piston rod is depressed, ports in the casing above and below the piston, a press cylinder port in open communication with the bore of the piston rod and an exhaust port communicating with the press cylinder port when the piston rod is elevated and its valve closed.

6. The combination with a pressure pipe, an exhaust pipe, a three-way pilot valve connected up with each, a valve casing, a piston and piston rod in said casing, the rod being hollow and open at its end, a valve for normally closing the upper open end of said hollow piston rod, a port connected with a pipe leading from the pilot valve to the valve casing above the piston in the latter, a port in said casing below the piston in communication with the pressure pipe, a port leading from the casing to the press cylinder and in open communication with the bore of the piston rod and an exhaust port in the casing connected with the exhaust pipe, the said exhaust port being closed when the piston rod is depressed.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

HUGO HAISS.

Witnesses b N. 0. Farmers, MARJORIE MCLAUGHLIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent, Washington, D. 0. 

